Rotation:

Circular movement of an abject around a centre.

Learning objective

Rotate shapes about a given point：

Identify object, image, centre of rotation, direction and describe the

rotation.

What 3 pieces of information do you need to be able to rotate a

shape? 1) the direction of the

rotation (clockwise or anti-clockwise)

2) the angle (90˚, 180˚, 270˚)

3) the centre of rotation (always given as a co-ordinate)

Rotate the point 90˚ clockwise about the origin.

Rotation

Rotate the point 90˚ clockwise about the origin.

Rotation

Rotate the point 90˚ clockwise about the origin.

Rotation

Rotate the point 90˚ clockwise about the origin.

RotationA

B

C

D

Rotate the point 90˚ anti-clockwise about the origin.

RotationA

B

C

D

Rotate the shape 90˚ clockwise about the origin.

Rotation

Rotate the shape 90˚ anti-clockwise about the origin.

Rotation

Rotate the shape 180˚ about the origin.

Rotation

Rotate the shape 180˚ about the origin.

Rotation

Rotations• A rotation turns a shape about a fixed

point.

• This point is called the centre of rotation.

• You need three things to describe a rotation

1) the direction of the rotation (clockwise or anti-clockwise)

2) the angle (90˚, 180˚, 270˚)3) the centre of rotation (always

given as a co-ordinate)

Rotate the shape 90˚ clockwise about the point (-2,2).

Rotation

Rotate the shape 90˚ anti-clockwise about the point (3,0).

Rotation

Rotate the shape 180˚ about the point (-1,-2).

Rotation

Identify the centre of rotation.

Rotation

(1,3) Describe the rotation.

Rotation of ___0 about ( _ , _).

Identify the centre of rotation.

Rotation

(0,1) Describe the rotation.

Rotation of ___0 about ( _ , _).

Identify the centre of rotation.

Rotation

(-2,-1)

Describe the rotation.

Rotation of ___0 about ( _ , _).

Identify the centre of rotation.

Rotation

(4,-1)

Describe the rotation.

Rotation of ___0

_(C/A)_about ( _ , _).

Identify the centre of rotation.

Rotation

(-1,-3)

Describe the rotation.

Rotation of ___0

_(C/A)_about ( _ , _).